Cloth-cutting machine.



PATENTED APR. 23, 1907. .J. B. GURY. CLOTH CUTTING MACHINE.- APPLICATION FILED nuns. 1906.

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No 8501927. PATB-NTED APR. 23. 1907. J. B. GURY. v

CLOTH CUTTING MACHINE.

APPLICATION rum) mum, 190s.

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JOHN B. GURY, OF ST. LOUIS, MISSOURI.

CLOTH-CUTTING MACHINE.

Specification of Letters Patent.

Patented April 23, 1907.

Application filed July 16, 1906. Serial No- 326,389.

To all whom it may concern:

Be it known that I, JOHN B. GURY, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Cloth-Cutting Machines, of which the following is a specification.

My invention relates to cloth-cutting machines, and has for its principal objects to minimize the friction, to counterbalance the reciprocating knife, to prevent the knife from accidentally shifting from its proper position, to simplify the mechanical construction, to improve the resser-foot, and to secure other advantages hereinafter appearing.

My invention consists in the parts and in the construction and arrangements of parts hereinafter described and claimed.

In the accompanying drawings, which form part of this specification and wherein like symbols refer to like parts wherever they occur, Figure 1 is a side elevation of a cutting-machine embodying my invention, a portion of the base and standard being shown in section. Fig. 2 is an elevation at right angles to Fig. 1, a portion of the guardingcase being shown in section. Fig. 3 is a vertical detail view of the knife-operating mechanism from the side opposite that of Fig. 1. Fig. 4 is a horizontal section on the line 4 4 of Fig. 1. Fig. 5 is a vertical sectional detail through the knife-clamping device, taken on the line 5 5 of Fig. 4; and Fig. 6 is a perspec tive detail view of the disk member of the knife-clamping device.

The cutting-machine is mounted upon a base 1, having a curved front edge and supported on rollers 2, which are so located that the base just clears the surface on which it stands. A standard 3 is mounted on the base and terminates at its top in a table 4, on which is screwed or otherwise fastened a skeleton frame 5. This skeleton frame 5 has an electric motor 6 screwed or otherwise fastened thereto directly above the standard that is, in alinement with the standardso that its weight is symmetrically distributed and balanced above said standard, whereby the tendency to vibrate is reduced to a minimum.

The standard 3 is preferably made of a single piece and is provided with a slot or slideway 7, which serves as a guide for a knife 8.

The upper end of the knife projects above the top of the standard and is secured to an arm 9 of a rock-shaft 10, which is j ournaled in the skeleton frame. This rock-shaft has a second arm 11, which is pivotally connected to a link 12, and this link in turn is pivotally connected to awrist-pin 13, eccentrically secured to the driving-shaft 14 of the electric motor. Preferably the disk 15, upon which the wristpin is mounted, is slit radially and provided with a clamping-screw whereby it may be firmly clamped to the motor-shaft. The disk is preferably lightened by removing some of its outer portion, the remaining por tions being properly counterbalanced.

The knife is secured to the rock-arm 9by a pivotal connection arranged to permit the vertical reciprocation of the knife. In order to position the knife in axial alinement with the rock-arm 9, the outer portion 16 of said arm 9 is slightly offset and provided with a laterally-extending hub 17. Abutting flatwise against the offset portion 16 is a disk 18, having a laterally-projecting pintle 19, which extends through the bore of the hub 17 and has a screw-thread. tapped in its end. In this screw-thread works a headed screw 20, which serves to hold a disk in place without clamping it against the offset portion of the arm 9, whereby the disk 18 is pivotally secured in place. On the opposite side of the disk 18 is a screw-threaded pintle 21. The upper end of the knife-blade is slotted or bifurcated, whereby it is adapted to straddle the pintle 21. Mounted on the pintle 21 is a washer or disk 22, which is forced and held against the bifurcated end of the knife and by means of a nut 23, working on the end of the pintle 21. The bifurcated end of the knife is thus firmly clamped against the disk 18, which disk is pivotallymounted. on the rock-arm 9. The disk 18 is provided on its face with a lug 24, arranged in radial alinement with the pintle (either above or below it) and of proper size to fit between the bifurcated end portions of the knife, whereby the knife and the disk must move together. In order that this lug 24 shall not interfere with the clamping of the knife-blade, it is arranged to project from the disk 18 less than the thickness of the knife-blade. Upon the periphery of the disk is a lug or limiting-stop 25, arranged to bear against a projecting portion 26 of the arm when the knife is at the lowermost position of its vertical stroke. On account of this arrangement of the limiting-stop the knife is prevented from swinging outwardly as it approaches its lowermost position. This arrangement also prevents the turning of the knife during the operation of clamping it. A similar lug 25 may be arranged on the disk to cooperate with a shoulder 26 of the framework to limit the oscillatorymovement of the disk 18 in the op posite direction.

In order to partially counterbalance the weight of the reciprocating parts, the arm 9 has a tension-spring 27 extendingupwardly therefrom to a suitable portion of the skeleton frame. In order to keep the knife in its slideway, a tensionspring 28 is secured to a pin 29, provided therefor on the disk 18 and to a stud on the arm 9. On account of the pin 29 being mounted eccentrically the tension of the spring 28 thereon tends to turn the disk and to hold the knife in its slideway but the friction is very slight.

On the base of the skeleton frame is adjustably mounted a presser-foot 33, whose lower ends 30 31 are bent horizontally and then upturned. One of these end portions is bent forwardly and the other, 31, is bent rearwardly, whereby the bearing area is increased and the operators vision is less obstructed. This pressure-piece is bifurcated almost to its upper end, the vertical opening being opposite the knife. This construction permits the knife to be inserted and removed without interfering with the adjustment of the presser-foot. The presser-foot is adjustably mounted by means of a headed clamping-screw 32, which fits between its forks and has a knurled head for convenient manipulation thereof.

The cutting machine hereinbefore described is adapted for high speed, and the friction of its working parts is reduced to a minimum.

Obviously the construction hereinbefore described admits of considerable modification without departing from my invention, and I do not wish to be limited to such details of construction as are hereinbefore described.

What I claim is 1. A reciprocating cutting-machine comprising abase, a standard having a knife-slot therein and a knife in said slot, a horizontal rockshaft, a motor mounted above said standard and in alinement therewith, a link eccentrically connected to the end portions of the motor-shaft and pivotally connected to an arm on said rock-shaft, a second arm on said rock-shaft to which said knife is pivotally connected and a spring tending to hold said knife in said slot.

2. A reciprocating cutting-machine comprising a base, a standard having a knife-slot therein and a knife in said slot, a horizontal rock-shaft, a motor mounted above said standard and in alinement therewith, a link eccentrically connected to the end portions of the motor-shaft and pivotally connected to an arm on said rock-shaft, a second arm on said rock-shaft to which said knife is pivotally connected, a spring tending to hold said knife in said slot, and a second spring acting upwardly on an arm of the rock-shaft to partially counterbalance the weight of the vertically-moving parts.

3. A reciprocating cutting-machine comprising a standard having a knife-slot therein and a knife in said slot, a rook-arm, a motor for actuating said rock-arm and means for pivotally connecting said knife to said rockarm, said means comprising a knife-clamping device one member of which is rotatably mounted on said rock-arm.

4. A reciprocating cutting-machine comprising a standard having a knife-slot therein and a knife in said slot, a rockarm, a motor for actuating said rock-arm and means for pivotally connecting said knife to said rockarm, said means comprising a disk rotatably mounted on said rock arm, and having a screw-threaded pintle and a' clamping-nut, the end of the knife being bifurcated to straddle said pintle.

5. A reciprocatlng cutting-machine comprising'a standard having a knife-slot therein and a knife in said slot, a rock-arm, a motor for actuating said rock-arm and means for pivotally connecting said knife to said rockarm, said means comprising a disk rotatably mounted on said rock-arm and having a screw-threaded pintle and a clamping-nut, the end of the knife being bifurcated to straddle said pintle, and said disk having a lug arranged to cooperate with a shoulder on the arm to limit the oscillatory movement of the knife.

6. A reciprocating cutting-machine comprising a standard having a knife-slot therein and a knife in said slot, a rock-arm, a motor for actuating said rock-arm and means for Ice pivotally connecting said knife to said rock- V arm, said means comprising a disk rotatably mounted on said rock-arm and having a screw-threaded pintle and a clamping-nut, the end of the knife being bifurcated to straddle said pintle, and said disk having a lug arranged to cooperate with a shoulder on the arm to limit the oscillatory movement of the knife, and said disk having a second lug in position to be straddled by the forked end portions of said knife.

7. A reciprocating cloth-cutting machine comprising a standard having a knife-slot therein and a knife in said slot, a frame and actuating mechanism on said standard, and tion and removal of the knifewithout shifting a presser-foot on said frame, said presser-foot said presser-foot. m comprising an elongated vertically-bifur- Signed at St. Louis, Missouri, this 14th day cated body portion and horizontal end porof July, 1906.

tions turned in opposite directions, said hori- JOHN B. GURY. zontal portions being arranged to straddle Witnesses:

said standard and the vertical opening being G. A. PENNINGTON,

opposite the knife so as to permit the inser- JAMES A. CARR. 

